[PATCH] drm/xe/xe2: Add workaround 16020183090

[Lucas De Marchi]

Graphics version 20.04, used in Lunar Lake, needs WA 16020183090 for
steppings A*. Set ENABLE_SEMAPHORE_POLL_BIT in INSTPM(RENDER_RING_BASE)
and whitelist CSBE_DEBUG_STATUS for userspace to be able to use it
and complement the workaround.

Cc: Haridhar Kalvala <haridhar.kalvala at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/xe/regs/xe_engine_regs.h | 4 ++++
 drivers/gpu/drm/xe/xe_reg_whitelist.c    | 8 ++++++++
 drivers/gpu/drm/xe/xe_wa.c               | 5 +++++
 3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/xe/regs/xe_engine_regs.h b/drivers/gpu/drm/xe/regs/xe_engine_regs.h
index 3942db268b01..93d83ceba873 100644
--- a/drivers/gpu/drm/xe/regs/xe_engine_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_engine_regs.h
@@ -46,6 +46,9 @@
 #define RING_EMR(base)				XE_REG((base) + 0xb4)
 #define RING_ESR(base)				XE_REG((base) + 0xb8)
 
+#define INSTPM(base)				XE_REG((base) + 0xc0, XE_REG_OPTION_MASKED)
+#define   ENABLE_SEMAPHORE_POLL_BIT		REG_BIT(13)
+
 #define RING_CMD_CCTL(base)			XE_REG((base) + 0xc4, XE_REG_OPTION_MASKED)
 
 #define CSFE_CHICKEN1_REG(base)			XE_REG((base) + 0xd4, XE_REG_OPTION_MASKED)
@@ -92,6 +95,7 @@
 #define   TAIL_ADDR				0x001FFFF8
 
 #define RING_CTX_TIMESTAMP(base)		XE_REG((base) + 0x3a8)
+#define CSBE_DEBUG_STATUS(base)			XE_REG((base) + 0x3fc)
 
 #define RING_FORCE_TO_NONPRIV(base, i)		XE_REG(((base) + 0x4d0) + (i) * 4)
 #define   RING_FORCE_TO_NONPRIV_DENY		REG_BIT(30)
diff --git a/drivers/gpu/drm/xe/xe_reg_whitelist.c b/drivers/gpu/drm/xe/xe_reg_whitelist.c
index e66ae1bdaf9c..3fa2ece7d228 100644
--- a/drivers/gpu/drm/xe/xe_reg_whitelist.c
+++ b/drivers/gpu/drm/xe/xe_reg_whitelist.c
@@ -7,9 +7,11 @@
 
 #include "regs/xe_engine_regs.h"
 #include "regs/xe_gt_regs.h"
+#include "regs/xe_regs.h"
 #include "xe_gt_types.h"
 #include "xe_platform_types.h"
 #include "xe_rtp.h"
+#include "xe_step.h"
 
 #undef XE_REG_MCR
 #define XE_REG_MCR(...)     XE_REG(__VA_ARGS__, .mcr = 1)
@@ -56,6 +58,12 @@ static const struct xe_rtp_entry_sr register_whitelist[] = {
 				   RING_FORCE_TO_NONPRIV_DENY,
 				   XE_RTP_ACTION_FLAG(ENGINE_BASE)))
 	},
+	{ XE_RTP_NAME("16020183090"),
+	  XE_RTP_RULES(GRAPHICS_VERSION(2004), GRAPHICS_STEP(A0, B0),
+		       ENGINE_CLASS(RENDER)),
+	  XE_RTP_ACTIONS(WHITELIST(CSBE_DEBUG_STATUS(RENDER_RING_BASE), 0))
+	},
+
 	{}
 };
 
diff --git a/drivers/gpu/drm/xe/xe_wa.c b/drivers/gpu/drm/xe/xe_wa.c
index 23f1285135b8..f3326825bef5 100644
--- a/drivers/gpu/drm/xe/xe_wa.c
+++ b/drivers/gpu/drm/xe/xe_wa.c
@@ -737,6 +737,11 @@ static const struct xe_rtp_entry_sr lrc_was[] = {
 	  XE_RTP_RULES(GRAPHICS_VERSION(2004), ENGINE_CLASS(RENDER)),
 	  XE_RTP_ACTIONS(SET(XEHP_PSS_CHICKEN, FLSH_IGNORES_PSD))
 	},
+	{ XE_RTP_NAME("16020183090"),
+	  XE_RTP_RULES(GRAPHICS_VERSION(2004), GRAPHICS_STEP(A0, B0),
+		       ENGINE_CLASS(RENDER)),
+	  XE_RTP_ACTIONS(SET(INSTPM(RENDER_RING_BASE), ENABLE_SEMAPHORE_POLL_BIT))
+	},
 
 	{}
 };
-- 
2.40.1